New subject: [CTPP] Release of Census 2000 Data Product on Daytime Population

20 Oct 2005

Ed,

MY guess is that you are "on the mark" in this regard.  That is the
approach that I seem to understand from what has been given below.

I received two separate inquiries back in July about the "daytime
population of downtown Minneapolis".  My response was to question their
definition of "daytime population" and indicated that the only
information I had available to me was the CTPP "Journey-to-Work"
tabulations.  I made it clear that this did NOT include other trip
purposes to downtown, such as shopping, non-home but work-related trips
and the like.

I suppose that as long as all regions are treated likewise, you could
at least get some comparative measurement of this information.

Bob Paddock
Transportation Research
Metropolitan Council
230 East 5th Street
St. Paul, MN  55107-1633

651 602-1340

...
 >> Ed Christopher <edc(a)berwyned.com>
10/20/05 11:28AM >>> This is interesting but I wonder how it would compare
or relate to
CTPP
data.  From the posting I am not quite sure what the CB is including
as
daytime population.  Thinking in CTPP terms I would take what I call
CTPP
Part 2 workers for any given area and add to it some portion of the
Part 1
non- workers and then sum them together as my daytime population.  Do
you
think this is what the CB did?

Chuck Purvis wrote:

...
  This is a message sent to the State Data Center
listserv this morning,
...
  10/20/05:

 FROM THE DESK OF STANLEY J. ROLARK
 CHIEF, CUSTOMER LIAISON OFFICE

 October 20, 2005

 Subject:                Release of Census 2000 Data Product on
                         Daytime Population

 The Census Bureau will be releasing later today or tomorrow, Census
 2000
 data on the daytime population.  The data are being released for all
 counties (or co. equivs.) by state in the U.S. There are also subtotal
...
  lines for each state and for the U.S. as a whole.
There are data for
 the
 municipios in Puerto Rico, and a total for Puerto Rico.

 There are data for places (incorp. and CDPs) in the U.S. by state, but
...
  no
 place data for Puerto Rico. The universe is places with either 2,500
 workers living in the place or 2,500 workers working in the place.

 There will be three separate Excel files. They will be accessible
 through
 the Subjects A to Z index, from a link entitled Daytime Population.

    Table 1 is a summary for places by size. All places > 250,000 are
 shown,
    in three size classes. Places less than 250,000 are shown in six
 size
    classes, but only the first twenty based on percent increase in
 daytime
    pop are shown for each size in Table 1.

    Table 2 shows all counties by state in the U.S. and Puerto Rico.

    Table 3 shows places with 2,500 workers living in or working in, by
...
     state, for the U.S. (not PR).

 The data product was developed by the Journey to Work and Migration
 Statistics Branch in Population Division. The data were developed by
 combining the Census 2000 data on the residence population with the
 Census
 2000 sample data on place of work. The estimates of daytime population
...
  to
 be released by the Census Bureau only adjust resident populations for
...
  travel into or out of an area for work purposes. No
adjustment is made
...
  for
 travel to school, shopping, recreation, tourism, health care or for
 any
 other trip purpose. The data sources required for making these
 adjustments
 are not available on a consistent, nationwide basis. Furthermore, the
...
  adjustments to resident population reflected in these
"daytime"
 population
 estimates do not take the time of day work trips are made into account.
...
  The
 simplifying assumption is made that all workers leave the area in the
...
  morning and return to the area in the evening.

 The release will include data items on the number of workers working in
...
  the
 area, the number of workers living in the area, the estimated daytime
...
  population, the number and percent change due to
commuting, the number
...
  and
 percent of the workers who lived in the area that also worked in the
 area,
 and the employment-residence ratio (workers working in/workers living
...
  in).

 The data are likely to be released with a press release but with no
 press
 embargo.  While you will be receiving a copy of the press release as
 part
 of our normal procedures, I did want to provide you with a "heads
 up" about
 this release as you may receive questions and/or have an interest in
 this
 release.  Census Bureau contact information regarding this release will
...
  be
 included at the top of the press release.

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--
Ed Christopher
708-283-3534 (V)
708-574-8131 (cell)

FHWA RC-TST-PLN
19900 Governors Dr
Olympia Fields, IL 60461

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Re: [CTPP] Release of Census 2000 Data Product on Daytime Population